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Operating Systems HP-UX Need help to understand chatr command
# 1  
Old 10-02-2008
MySQL Need help to understand chatr command
Hi,
I am trying to find the max memory utilization of a binary file using chatr command.
i gave chatr <file name>. But no where i could see the max memory usage of the file. How do you i check the memory usage of this binary file.

Upto my knowledge it should be 1.75GB in HP-UX. But the does the compiled binary by itself has some limitation????

Thanks....
-Prasanna.K
# 2  
Old 10-03-2008
chatr is mostly used for changing the attributes of a compiled image file. See setrlimit or ulimit.

Since programs dynamically allocate memory, you cannot tell anything from the compiled image about memory usage.

There can be per process limits set with ulimit. The kernel parameter maxdsize determines the maximum allowable data size for a process - this is from the manual:

Quote:
NAME
maxdsiz, maxdsiz_64bit — maximum size (in bytes) of the data segment for any user process

VALUES

Default
32bit: 1 GB

64bit: 4 GB

Allowed values

32 bit minimum: 0x40000

32 bit maximum: 0xfffff000

64 bit minimum: 0x40000

64 bit maximum: 0x3ffbffff000

DESCRIPTION
User programs on HP-UX systems are composed of five discrete segments of virtual memory: text (or code), data, stack, shared, and I/O. Each segment occupies an architecturally defined range of the virtual address space that sets the upper limit to their size, but text, data and stack segments may have smaller maxima enforced by the maxtsiz, maxdsiz, and maxssiz tunables.

This tunable defines the maximum size of the static data storage segment for 32-bit and 64-bit processes. The data storage segment contains fixed data storage such as globals, arrays, static variables, local variables in main(), strings, and space allocated using sbrk() and malloc(). In addition, any files memory mapped as private and shared library per-invocation data also resides in the data segment.

HTH
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